What did the petcock do in a pressure canner?
The petcock was the valve that you’d use to start the pressure buildup as well as ensure all pressure / vacuum was released after canning and cool down. It also functioned as a pressure release. Some older canners didn’t have an over-pressure plug, so it was the only over pressure device.
What’s the difference between a petcock and a gas valve?
Petcocks are commonly and interchangeably referred to as fuel valve, gas valve, gas cock or petcock. A mechanical petcock is attached to the fuel tank and has one outgoing fuel line. It is simply an on off valve. When in the off position there should be no fuel flow to the carb.
Where does the petcock go in a snowmobile?
The second type of fuel petcock is vacuum operated. It attaches to the fuel tank and has one or more outgoing fuel lines and one small vacuum line going to the cylinder head or carb to cylinder head air boot. Snowmobiles sometimes use a vacuum port off the engine block.
Can a petcock be used as an over pressure plug?
(I left mine and it seems to have been fine for years now.) If you need to replace the over-pressure plug, the petcock can be used as an over-pressure device. You would then add a new vent-tubeand weightin place of your blown-out over pressure plug.
What did petcocks used to be used for?
Historically, petcocks were used on gravity-feed fuel systems found on automobiles. With universal adoption of fuel pumps they have all but disappeared in that application.
What’s the difference between a ball valve and a petcock?
Historically, petcocks were threaded valves controlled by a butterfly handle; modern petcocks are typically ball valves. Compared to the progressive control of a gate valve a ball valve style petcock’s is coarse, confining their use principally to on-off applications.
The petcock was the valve that you’d use to start the pressure buildup as well as ensure all pressure / vacuum was released after canning and cool down. It also functioned as a pressure release. Some older canners didn’t have an over-pressure plug, so it was the only over pressure device.
The second type of fuel petcock is vacuum operated. It attaches to the fuel tank and has one or more outgoing fuel lines and one small vacuum line going to the cylinder head or carb to cylinder head air boot. Snowmobiles sometimes use a vacuum port off the engine block.